content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import java.util.concurrent.*;
  
  import io.reactivex.common.*;
  import io.reactivex.observable.*;
  
  /**
   * Waits until the source Future completes or the wait times out; treats a {@code null}
   * result as indication to signal {@code onComplete} instead of {@code onSuccess}.
   *
   * @param <T> the value type
   */
  public final class MaybeFromFuture<T> extends Maybe<T> {
  
      final Future<? extends T> future;
  
      final long timeout;
  
      final TimeUnit unit;
  
      public MaybeFromFuture(Future<? extends T> future, long timeout, TimeUnit unit) {
          this.future = future;
          this.timeout = timeout;
          this.unit = unit;
      }
  
      @Override
      protected void subscribeActual(MaybeObserver<? super T> observer) {
          Disposable d = Disposables.empty();
          observer.onSubscribe(d);
          if (!d.isDisposed()) {
              T v;
              try {
                  if (timeout <= 0L) {
                      v = future.get();
                  } else {
                      v = future.get(timeout, unit);
                  }
              } catch (InterruptedException ex) {
                  if (!d.isDisposed()) {
                      observer.onError(ex);
                  }
                  return;
              } catch (ExecutionException ex) {
                  if (!d.isDisposed()) {
                      observer.onError(ex.getCause());
                  }
                  return;
              } catch (TimeoutException ex) {
                  if (!d.isDisposed()) {
                      observer.onError(ex);
                  }
                  return;
              }
              if (!d.isDisposed()) {
                  if (v == null) {
                      observer.onComplete();
                  } else {
                      observer.onSuccess(v);
                  }
              }
          }
      }
  }
  